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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5d4961f54ae6f7d5ff55516a9598e4795c32ccc4490db0e2a5c5a27360dbc8' 
  AND token = 'oia3DSWIPEKQxbyjqGtzmYOdB90d8AOzOwYqSu5K+nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}